Gottfried Plattner is, in spite of his name, a free-born Englishman. His father was an Alsatian who came to England in the Sixties, married a respectable English girl of unexceptionable antecedents, and died, after a wholesome and uneventful life (devoted, I understand, chiefly to the laying of parquet flooring), in 1887. Gottfried's age is seven-and-twenty. He is, by virtue of his heritage of three languages, Modern Languages Master in a small private school in the South of England. To the casual observer he is singularly like any other Modern Languages Master in any other small private school. His costume is neither very costly nor very fashionable, but, on the other hand, it is not markedly cheap or shabby; his complexion, like his height and his bearing, is inconspicuous. You would notice, perhaps, that, like the majority of people, his face was not absolutely symmetrical, his right eye a little larger than the left, and his jaw a trifle heavier on the right side. If you, as an ordinary careless person, were to bare his chest and feel his heart beating, you would probably find it quite like the heart of anyone else. But here you and the trained observer would part company. If you found his heart quite ordinary, the trained observer would find it quite otherwise. And once the thing was pointed out to you, you too would perceive the peculiarity easily enough. It is that Gottfried's heart beats on the right side of his body. Now, that is not the only singularity of Gottfried's structure, although it is the only one that would appeal to the untrained mind. Careful sounding of Gottfried's internal arrangements, by a well-known surgeon, seems to point to the fact that all the other unsymmetrical parts of his body are similarly misplaced. The right lobe of his liver is on the left side, the left on his right; while his lungs, too, are similarly contraposed. What is still more singular, unless Gottfried is a consummate actor, we must believe that his right hand has recently become his left. Since the occurrences we are about to consider (as impartially as possible), he has found the utmost difficulty in writing, except from right to left across the paper with his left hand. He cannot throw with his right hand, he is perplexed at meal times between knife and fork, and his ideas of the rule of the road--he is a cyclist--are still a dangerous confusion. And there is not a scrap of evidence to show that before these occurrences Gottfried was at all left-handed.